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Definition of upthrow in English:

upthrow

verb

Displace (a body of rock) upward on one side of a fault relative to the other.

‘the oilfields are situated on top of upthrown fault blocks’

‘They are often seen together with features called ‘horsts’, which are upthrown blocks lying between two steep-angled fault blocks.’

‘This line was acquired over the upthrown block of the mapped Christchurch Fault.’

‘By way of contrast, regions on a fault's upthrown side have less load and so experience uplift.’

noun

Geology

An upward displacement of a body of rock on one side of a fault.

‘The exploration geologist or geophysicist searching for these resources would be able to estimate that greater reserves would be preserved on the downthrow side of the fault, in contrast to its upthrow side.’